Hello Sean Wang,
The patch 1c099ab44727: "mt76: mt7921: add MCU support" from Jan 28,
2021, leads to the following static checker warning:
drivers/net/wireless/mediatek/mt76/mt7921/mcu.c:409 mt7921_mcu_tx_rate_report()
error: potentially dereferencing uninitialized 'stats'.
drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
390 static void
391 mt7921_mcu_tx_rate_report(struct mt7921_dev *dev, struct sk_buff *skb,
392 u16 wlan_idx)
393 {
394 struct mt7921_mcu_wlan_info_event *wtbl_info =
395 (struct mt7921_mcu_wlan_info_event *)(skb->data);
396 struct rate_info rate = {};
397 u8 curr_idx = wtbl_info->rate_info.rate_idx;
398 u16 curr = le16_to_cpu(wtbl_info->rate_info.rate[curr_idx]);
399 struct mt7921_mcu_peer_cap peer = wtbl_info->peer_cap;
400 struct mt76_phy *mphy = &dev->mphy;
401 struct mt7921_sta_stats *stats;
402 struct mt7921_sta *msta;
403 struct mt76_wcid *wcid;
404
405 if (wlan_idx >= MT76_N_WCIDS)
406 return;
407 wcid = rcu_dereference(dev->mt76.wcid[wlan_idx]);
408 if (!wcid) {
409 stats->tx_rate = rate;
^^^^^^^^^^^^^^^^^^^^^
Not initialized
410 return;
411 }
412
413 msta = container_of(wcid, struct mt7921_sta, wcid);
414 stats = &msta->stats;
^^^^^^^^^^^^^^^^^^^^
415
416 /* current rate */
417 mt7921_mcu_tx_rate_parse(mphy, &peer, &rate, curr);
418 stats->tx_rate = rate;
419 }
regards,
dan carpenter